defmodule Main do
  def input, do: IO.read(:line) |> String.trim
  def ii, do: input() |> String.to_integer
  def li, do: input() |> String.split |> Enum.map(&String.to_integer/1)

  def main do
    n = ii()

    x = trunc(:math.sqrt(2 * n))
    if 2*n == x*(x+1) do
      IO.puts "YES"
      IO.puts x
    else
      IO.puts "NO"
    end
  end
end